Yeah I am stoked with them, the wall seems quite thick to me, I run them on about 15lb out the bush and they bag out quite nicely, I have not got any cuts on the side walls at all yet.
I run a set of 30" Micky Thomson 5 Rib ATZ for around town, not because I am worried about the life of the Insa's just because of fuel economy and the amount of low down power you lose with the 32"s. Saying that I just put mine back on today so I can have a bit of a play tomorrow and for when I head away on my next decent trip in 3 weeks.
Give the guy selling them a call if you need any real info, I think his name is Andrew and his number is 0419 394 972. Its on the logo on the e-bay store home page.
Good luck with them and let me know how you go.